+To create a Length constraint in the active Sketch:
+
+#. select in the Main Menu *Sketch - > Length* item or
+#. click **Length** button in Sketch toolbar:
+
+.. image:: images/length.png
+ :align: center
+
+.. centered::
+ **Length** button
+
+Property panel:
+
+.. image:: images/Length_panel.png
+ :align: center
+
+Input fields:
+
+- **Line** is the the line object selected in the view;
+- **Value** is a line length, can be modified to set the desirable value;
+- **Text location** is a position of the length value label relating to extension line (in the view):
+ .. image:: images/location_left.png
+ :align: left
+ **Left** inserts text to the left of the length extension line;
+
+ .. image:: images/location_automatic.png
+ :align: left
+ **Automatic** inserts text in the middle of the length extension line if it has enough length, otherwise - to the left;
+
+ .. image:: images/location_right.png
+ :align: left
+ **Right** inserts text to the right of the length extension line.
+
+When the line is selected, the length value is displayed in the property panel and in the view.
+
+When creating the constraint, after selection of a line for the first time:
+
+- drag the length presentation in the view to the desired position and click once;
+- set desirable length value in the input field in the view and press **Enter** or just press **Enter** to keep the current length.
+
+.. image:: images/Length_field_view.png
+ :align: center